glaucophane

Glaucophane is a mineral and a mineral group belonging to the sodic amphibole supergroup of the double chain inosilicates, with the chemical formula Na2(Mg3Al2)Si8O22(OH)2.

Key facts

Mineral.name: Glaucophane
Mineral.category: Inosilicates Sodic amphibole group
Mineral.image: Glaucophane bleu de Groix.jpg
Mineral.imagesize: 260px
Mineral.caption: Glaucophane with fuchsite (white oval)
Mineral.formula: ☐Na2(Mg3Al2)Si8O22(OH)2
Mineral.IMAsymbol: Gln
Mineral.strunz: 9.DE.25
Mineral.system: Monoclinic
Mineral.class: Prismatic (2/m) (same H-M symbol)
Mineral.symmetry: C2/m
Mineral.habit: slender long prisms, Massive granular to columnar
Mineral.cleavage: Good on [110] and on [001]
Mineral.fracture: Brittle – conchoidal
Mineral.mohs: 6.0–6.5
Mineral.luster: Vitreous – pearly
Mineral.streak: Grayish blue
Mineral.diaphaneity: Translucent

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Wikidata facts

Named after: visual appearance
Image: Glaucophane bleu de Groix.jpg

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Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 9.DE.25
Commons category: Glaucophane
Nickel-Strunz 9th edition (updated 2009): 9.DE.25
crystal system: monoclinic crystal system
IMA Mineral Symbol: Gln
chemical formula: ☐Na₂(Mg₃Al₂)Si₈O₂₂(OH)₂
Strunz 8th edition (series ID, updated): VIII/D.05d

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Encyclopedic overview

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Contents

Name
Characteristics
Occurrence
See also
References
External links

Glaucophane is a mineral and a mineral group belonging to the sodic amphibole supergroup of the double chain inosilicates, with the chemical formula Na2(Mg3Al2)Si8O22(OH)2.

Glaucophane crystallizes in the monoclinic system.

Excerpted from Wikipedia’s “glaucophane” article, available under the CC BY-SA 4.0 licence.

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